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Programming Logic Controllers

Programming Logic Controllers. Overview - Chapter 1. PLC Use. Machine control Process control Motion control Batch control Diagnostic Other Usually Multiple applications. History and Development. 1960’s “Five hours to find it, five minutes to fix it ”. History.

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Programming Logic Controllers

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  1. Programming Logic Controllers Overview - Chapter 1

  2. PLC Use • Machine control • Process control • Motion control • Batch control • Diagnostic • Other • Usually Multiple applications

  3. History and Development • 1960’s • “Five hours to find it, five minutes to fix it”

  4. History • Richard Morley – Modicon • First PLC • ladder logic programming • Odo Josef Struger • Allen-Bradley

  5. History and Development • http://en.wikipedia.org/wiki/Programmable_logic_controller • http://en.wikibooks.org/wiki/Introductory_PLC_Programming • http://www.isa.org/Content/ContentGroups/News/2006/February24/History_of_the_PLC.htm • http://www.barn.org/FILES/historyofplc.html • http://www.control.lth.se/media/Education/DoctorateProgram/2012/HistoryOfControl/Vanessa_Alfred_report.pdf • http://www.plcs.net/chapters/history2.htm

  6. Block Diagram

  7. Block Diagram

  8. Block Diagram

  9. Central Processing Unit • http://en.wikipedia.org/wiki/Central_processing_unit • A central processing unit (CPU) is the hardware that carries out the instructions of a computer program by performing the basic arithmetical, logical, and input/output operations of the system.

  10. Memory Devices • RAM • ROM • ROM • Programmable ROM (PROM) • Erasable programmable ROM (EPROM or UVEPROM) • Electrically Erasable ROM (EEPROM) • Static RAM • Dynamic RAM

  11. Address Decoder Unit • Address to circuit • Binary number to path

  12. Binary • http://www.jodyculkin.com/category/comics-2/countingbinary

  13. Transisters and Gates • http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html • http://www.cs.bu.edu/~best/courses/modules/Transistors2Gates/ • http://www.cs.bu.edu/~best/courses/cs101/F95/lectures/FromGatesToAdder.html • http://www.electronics-tutorials.ws/logic/logic_10.html

  14. Peripheral Chips • Buffers • Data conversion • Networking • Voice • Voice Recognition • more

  15. Discrete Input Modules • Discrete means enumerable, countable, not continuous but distinct • Digital not analog • Real numbers are not discreet • Between 1.0 and 2.0 we have 1.50. • Always a number between x and y • Integers are discrete. No number falls between 1 and 2 • Generally • On or Off • 1 or 0 • True or False • Closed or Open

  16. Discrete Output Modules • Set to on/off • Set to true/false • Set to 1/0

  17. Analog Input/Output Devices • Analog is a continuous signal (wave) • Set to varying voltage levels • Inputs converted to digital via analog to digital converter logic • Digital to analog conversion occurs for outputs

  18. PLC Power Supply • Battery backup • Capacacitor allows battery exchange

  19. Allen-Bradley Programmable Logic Controllers • PICO • MicroLogix • Small Logix • SLC 500 Series • LAN and WAN capabilities • PLC-5 • May have thousands of I/0 ports

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